U.S. patent number 5,612,927 [Application Number 08/409,494] was granted by the patent office on 1997-03-18 for motorized latch and ejection mechanism for portable hard drive.
This patent grant is currently assigned to Summatec Computer Corporation. Invention is credited to Timothy J. Morrison, Lynn H. Wilson.
United States Patent |
5,612,927 |
Morrison , et al. |
March 18, 1997 |
Motorized latch and ejection mechanism for portable hard drive
Abstract
An apparatus for holding a portable hard disk drive in a
desk-top personal computer (PC) has a bay that fits into the 3.5"
form-factor cavity which is formed in most IBM.sup.R -compatible
PCs. The portable hard disk drive is disposed in a protective
sleeve. A motor-driven carriage is reciprocably positioned within
the bay, and the sleeve is advanced part way into the bay, until
the carriage engages the sleeve. Then, the carriage automatically
pulls the sleeve the rest of the way into the bay until the disk
drive is operably engaged with the computer. When it is desired to
eject the sleeve with disk drive, a button is pushed to cause the
carriage to push the sleeve out of the bay, perhaps after a short
delay time period to allow the disk drive to spin down prior to
ejection.
Inventors: |
Morrison; Timothy J.
(Oceanside, CA), Wilson; Lynn H. (Carlsbad, CA) |
Assignee: |
Summatec Computer Corporation
(Vista, CA)
|
Family
ID: |
23620730 |
Appl.
No.: |
08/409,494 |
Filed: |
March 23, 1995 |
Current U.S.
Class: |
361/679.39;
360/99.07; G9B/33.004; G9B/33.027; G9B/33.03 |
Current CPC
Class: |
G06F
1/184 (20130101); G06F 1/187 (20130101); G11B
33/025 (20130101); G11B 33/121 (20130101); G11B
33/124 (20130101) |
Current International
Class: |
G06F
1/18 (20060101); G11B 33/12 (20060101); G11B
33/02 (20060101); G06F 001/16 (); H05K
007/14 () |
Field of
Search: |
;360/98.04,98.05,98.06,99.06,99.07,97.01
;361/684,685,686,725,726,727 ;364/708.1 |
References Cited
[Referenced By]
U.S. Patent Documents
Other References
Disctec Removable Hard Drives Brochure "PC Computing Magazine" Oct.
or Nov. 1992 Winter Park, FL Vision Logic Advertisement San Jose CA
408-437-1000..
|
Primary Examiner: Picard; Leo P.
Assistant Examiner: Feild; Lynn D.
Attorney, Agent or Firm: Rogitz; John L.
Claims
What is claimed is:
1. An apparatus operably engageable with a cavity of a desk-top
personal computer (PC), comprising:
a sleeve for holding a hard computer disk drive, the sleeve being
formed with an engagement surface;
a bay positioned in the cavity of the computer for receiving the
sleeve, the bay including an opening for receiving the sleeve, the
bay being in electrical communication with the personal
computer;
a carriage reciprocally disposed in the bay, the carriage including
at least one clip configured for engaging the engagement surface of
the sleeve when the sleeve is advanced a predetermined distance
into the opening, the carriage further including a shuttle formed
with a plurality of nut docks; and
a motor coupled to the carriage for moving the carriage between an
engaged position, wherein the hard drive is electrically connected
to the personal computer, and a remove position, wherein the sleeve
can be manually removed from the bay, the motor being coupled to
the carriage via a lead screw and a nut, the lead screw being
threadably engaged with the nut and rotatable by the motor, the nut
being closely received in one of the nut docks such that rotation
of the nut is prevented thereby.
2. The apparatus of claim 1, further comprising a key element
connected to the bay and slidably engageable with the sleeve for
guiding the sleeve into the bay.
3. The apparatus of claim 2, wherein the key element includes left
and right elements opposed to each other relative to the bay.
4. The apparatus of claim 2, wherein the sleeve is formed with a
guide channel for engaging the key element.
5. The apparatus of claim 1, wherein the sleeve is formed with two
engagement surfaces and the carriage includes respective opposed
clips and a shuttle, each clip being pivotally connected to the
shuttle, each clip being biased to a disengaged position, wherein
the clip is distanced from the associated engagement surface of the
sleeve, each clip being pivotable to an engaged position, wherein
the clip engages the associated engagement surface of the
sleeve.
6. The apparatus of claim 5, further comprising two camming
surfaces formed on the bay, each camming surface being configured
for moving a respective one of the clips to the engaged position
when the carriage moves past a predetermined position relative to
the bay, to thereby engage the carriage with the sleeve.
7. The apparatus of claim 6, further comprising:
a first limit switch mounted on the bay for detecting when the
sleeve is in a home position and generating a signal in response
thereto to activate the motor; and
a second limit switch mounted on the bay for detecting when the
carriage is in the engaged position and generating a signal in
response thereto to deactivate the motor.
8. A method for transferring data from a desk-top personal computer
(PC) to a hard disk drive having a surrounding sleeve, comprising
the steps of:
(a) providing an opening in the desk-top PC;
(b) advancing the sleeve with hard disk drive into the opening;
(c) engaging the sleeve and automatically transporting the sleeve
with hard disk drive into the opening until electrical contact is
made between the hard disk drive and the PC, the transporting being
accomplished by;
engaging the sleeve with a carriage including a nut dock and a nut
held closely in the nut dock to thereby prevent rotation of the
nut;
threadably engaging a lead screw with the nut; and
rotating the lead screw;
(d) transferring data between the hard disk drive and the PC;
and
(e) ejecting the hard disk drive from the PC.
Description
FIELD OF THE INVENTION
The present invention relates generally to computer memory
apparatus, and more particularly to computer hard disk drives for
personal computers (PCs).
BACKGROUND
Computer data in desk-top personal computers (PCs) is ordinarily
stored on one of two generic types of direct access memory media,
i.e., memory media which can be accessed when the user is on-line
with the PC, and these two types of direct access memory media are
broadly know as "disks" and "drives". The first type of direct
access memory media is familiarly referred to as a "hard disk
drive". A hard disk drive may be internal, i.e., it may be mounted
within the PC, or external, i.e., it may be located next to the PC,
but in either case, hard disk drives require electrical connections
to the PC that can be cumbersome and time-consuming to make.
In contrast, a unit of the second type of direct access memory
media, familiarly referred to as a "floppy disk", is manually
inserted into a portion of the computer familiarly referred to as a
floppy disk drive, and a floppy disk can be easily and quickly
ejected from the floppy disk drive after data transfer. Thus, a
floppy disk can be ejected, i.e., manually urged outwardly from a
PC by pushing a button, without requiring that "hard" electrical
contacts be unmade. On the other hand, a hard disk drive currently
cannot be ejected from a desk-top PC, but must be disconnected from
electrical connections in the PC and then removed. Hard disk
drives, however, can store much more data than can floppy
disks.
Modern PCs typically permit the use of both kinds of memory media,
to afford the user of the PC the advantages associated with each.
More specifically, as stated above, hard disk drives, which are
ordinarily intended to be permanently connected to their respective
PCs, have a large data storage capacity. In contrast, floppy disks
have much lower data storage capability as compared to hard disk
drives, but can easily be ejected from the computer when it is
necessary to store data, e.g., confidential military or economic
data, apart from the computer, or to transport the data
computer-to-computer when a network is not available.
While this arrangement of data storage is useful, it has certain
drawbacks. For example, when sensitive military or economic data is
to be transferred from the permanent hard disk drive of a PC to a
floppy disk for secure storage of the data, the only thing
ordinarily "deleted" from the PC hard disk drive after data
transfer is the name of the file that contains the data. The data,
however, while inaccessible using most software, remains on the
hard disk drive, and can be retrieved using specialized software.
Thus, once confidential data has been stored on a permanently
mounted hard disk drive, both the hard disk drive and it's
associated PC must be treated as classified equipage.
Understandably, this increases security costs and limits the access
of non-cleared users to the PC.
Further, because of their relatively limited data storage
capability, floppy disks cannot be used to store large amounts of
data. Thus, if a large amount of data is to be transferred from the
hard disk drive of a computer, more than a single floppy disk may
be required. This increases expenses, tends to be labor-intensive,
and requires excessive storage space.
Consequently, when large amounts of data are to be physically moved
from a non-secure location to a comparatively secure area for data
analysis, the data is ordinarily stored on a hard disk drive which
is subsequently disconnected from the so-called host computer and
then transported to the secure area. For example, surveillance
aircraft tend to collect a large amount of data, and the collected
data is stored in relatively bulky hard disk drives that have large
data storage capacities. After mission completion, the disk drives
are electrically disconnected from their host computers, which as
stated above can be cumbersome and time consuming, and then removed
from the craft after the mission for data analysis. Furthermore,
many large hard disk drives unfortunately are heavy. This is a
disadvantage in most computer applications and particularly in
applications requiring airborne computer operation, wherein it is
generally crucial to minimize the weight and volume of articles
that are to be carried onboard the aircraft.
The above discussion focussed on but one application wherein data
portability is desirable, but the need for data portability is
acute in a wide variety of other applications requiring data
transfer between computers. Indeed, regardless of the particular
application, a growing need exists to transfer large amounts of
data between pairs of the ubiquitous desk-top personal computer.
For example, a person who is located at a site remote from his
desk-top PC (and its associated hard disk drive on which the
person's files and software are stored) may require access to some
or all of the data base (i.e., files and software) that is stored
on the hard disk drive. When networks or network software are
unavailable, the person must take his data base with him. He can do
this by disconnecting his hard disk drive from his PC, transporting
his hard disk drive with him, and then reconnecting the disk drive
to a computer located at the remote site. Alternatively, the person
can up-load his data base to a large number of floppy disks one at
a time, transport the floppy disks to the remote site, and then
down-load the data base from the floppy disks one at a time onto a
computer located at the remote site. Unfortunately, both procedures
are cumbersome and time-consuming.
In light of the above discussion, the above-referenced parent and
grandparent applications, as well as the present invention,
recognize a need to provide the portability advantages inherent in
floppy disks, without sacrificing the data storage capacity of hard
disk drives.
As further recognized by the present invention, owing to the
delicate nature of certain components of hard disk drives,
particular considerations arise in connection with a portable hard
disk drive system wherein the hard disk drive can be easily
advanced into and ejected from a PC. For example, certain internal
components of hard disk drives rotate very rapidly, and these
components must be allowed to "spin down" prior to ejecting the
disk drive from the computer. Otherwise, the disk drive could be
irreparably damaged. Furthermore, to increase the operational
convenience of the PC, provisions should ideally be made for
configuring the portable, ejectable hard disk drive as the main
drive (i.e., the so-called "C" drive) of the associated PC.
Accordingly, it is an object of the present invention to provide an
apparatus that can be associated with a desk-top personal computer
and which can hold a portable hard computer disk drive in operable
engagement with the computer. Another object of the present
invention is to provide an apparatus for easily inserting and
ejecting a portable hard disk drive into a desk-top personal
computer. Yet another object of the present invention is to provide
a portable hard disk drive housing for a desk-top personal computer
which is easy to use and cost-effective to manufacture. Still
another object of the present invention is to provide a system with
a portable, ejectable hard disk drive which automatically permits
the disk drive to adequately spin down prior to ejection from an
associated PC, and which provides for convenient operation of the
PC.
SUMMARY OF THE INVENTION
An apparatus is disclosed that is operably engageable with a cavity
of a desk-top personal computer (PC). The apparatus of the present
invention includes a sleeve for holding a hard computer disk drive,
and the sleeve is formed with an engagement surface. A bay is
positioned in the cavity of the computer for receiving the
sleeve.
In accordance with the present invention, the bay includes an
opening for receiving the sleeve, and the bay is electrically
connected to the personal computer. Moreover, a carriage is
reciprocally disposed in the bay, and the carriage includes at
least one clip that is configured for engaging the engagement
surface of the sleeve when the sleeve is advanced a predetermined
distance into the opening. A motor is coupled to the-carriage for
moving the carriage between an engaged position, wherein the hard
drive is electrically connected to the personal computer, and a
remove position, wherein the sleeve can be manually removed from
the bay.
In one presently preferred embodiment, a key element is connected
to the bay and is slidably engageable with the sleeve for guiding
the sleeve into the bay. The key element includes left and right
elements opposed to each other relative to the bay, and the sleeve
is formed with a guide channel for engaging the key element.
Preferably, the sleeve is formed with two engagement surfaces and
the carriage includes respective opposed clips and a shuttle. Each
clip is pivotally connected to the shuttle and each clip is biased
to a disengaged position, wherein the clip is distanced from the
associated engagement surface of the sleeve. Further, each clip is
pivotable to an engaged position, wherein the clip engages the
associated engagement surface of the sleeve.
As envisioned by the present invention, two camming surfaces are
formed on the bay. Each camming surface is configured for moving a
respective one of the clips to the engaged position when the
carriage moves past a predetermined position relative to the bay,
to thereby engage the carriage with the sleeve.
In the preferred embodiment, the carriage includes a lead screw
that is coupled to the motor for rotation of the lead screw by the
motor. Additionally, the carriage includes a nut which is
threadably engaged with the lead screw. To prevent relative motion
between the nut and the shuttle, the shuttle is formed with a
retaining cavity and the nut is positioned in the retaining cavity.
Consequently, when the motor rotates the lead screw, the nut
travels on the lead screw to cause the shuttle to move
translationally within the bay.
Motor control signals are generated by a first limit switch which
is mounted on the bay for detecting when the sleeve is in a home
position. The first limit switch generates a signal to activate the
motor. Also, a second limit switch is mounted on the bay for
detecting when the carriage is in the engaged position and for
generating a signal in response thereto to deactivate the
motor.
Another aspect of the present invention is an apparatus for
releasably holding a sleeve that contains a hard disk drive in
operable engagement with a computer which is formed with a cavity.
The apparatus includes a bay positioned in the cavity in electrical
communication with the computer, and a motor-driven carriage
disposed in the bay for moving the sleeve with hard disk drive into
operable engagement with the computer to permit data transfer
between the hard disk drive and the computer.
In still another aspect of the present invention, a computer system
includes a computer including a cavity and a bay positioned in the
cavity, and the bay is formed with an opening. A sleeve contains a
hard disk drive, and the sleeve with hard disk drive is movable
between an engaged position, wherein the hard disk drive is in
electrical communication with the computer, and a remove position,
wherein the sleeve with hard disk drive can be manually removed
from the bay. Also, a motor is operably engaged with the bay for
moving the sleeve with hard disk drive to the engaged position and
for selectively moving the sleeve with hard disk drive from the
engaged position toward the remove position. Furthermore, an eject
button is mounted on the bay. The eject button is selectively
manipulable to cause the motor to move the sleeve from the engaged
position toward the remove position.
In another aspect of the present invention, a method is disclosed
for transferring data from a desk-top personal computer (PC) to a
hard disk drive having a surrounding sleeve. The method includes
the steps of providing an opening in the desk-top PC, and advancing
the sleeve with hard disk drive into the opening. Then, the sleeve
is engaged and automatically transported into the opening until
electrical contact is made between the hard disk drive and the PC.
Next, data is transferred between the hard disk drive and the PC.
After data transfer, the hard disk drive is ejected from the
PC.
The details of the present invention, both as to its construction
and operation, can best be understood in reference to the
accompanying drawings, in which like reference numerals refer to
like parts, and in which:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded perspective view of the computer bay for
portable hard disk drives of the present invention, with portions
cut away and with an associated personal computer (PC) shown
schematically;
FIG. 2 is an exploded isometric view of the portable hard disk
drive and sleeve;
FIG. 3A is a top plan view of the computer bay, showing the disk
drive sleeve in phantom in the home position;
FIG. 3B is a top plan view of the computer bay, showing the disk
drive sleeve in phantom in the engaged position;
FIG. 3C is a top plan view of the computer bay, showing the disk
drive sleeve in phantom in the remove position;
FIG. 4 is a diagram of the electrical components of the present
invention; and
FIG. 5 is a flow chart of the logic of the present invention in
ejecting the hard disk from the bay.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring initially to FIG. 1, an apparatus, generally designated
10, is shown for holding a portable hard disk drive sleeve 12 in
operable engagement with a lap-top or desk-top personal computer
(PC) 14 (not to scale) having an associated video monitor 15. It is
to be understood in reference to FIG. 1 that the apparatus 10 fits
snugly within a standard-sized disk drive cavity 16 of the PC
14.
In the presently preferred embodiment, the PC 14 is a device
familiarly referred to as an International Business Machines (IBM)
compatible PC, e.g., an IBM.RTM. PS2 model 70 computer.
Accordingly, in the preferred embodiment the cavity 16 is the
so-called "3.5 inch form factor" cavity (actually four inches in
width) formed in most IBM compatible desk-top personal computers.
It is to be understood, however, that the principles of the present
invention can be applied to other IBM-compatible computers, e.g.,
lap-top computers, and to non-IBM compatible computers, e.g.,
Apple.RTM. brand computers, having cavities smaller or larger than
the cavity 16.
FIG. 1 shows that the apparatus 10 includes a bay 20 having an
opening 22. The opening 22 is covered by a movable flap 24, the
bottom edge of which is hingedly connected to the bay 20. The flap
24 is normally biased to completely block the opening 22, and the
sleeve 12 can be advanced against the flap 24 to cause the flap 24
to pivot inwardly about its bottom edge and thereby permit the
sleeve 12 to be advanced into the opening 22.
As can be appreciated in reference to FIG. 1, the portable hard
disk drive sleeve 12 with disk drive can be manually advanced into
the opening 22 of the bay 20 and held in operable engagement with
the personal computer 14. When the sleeve 12 is operably engaged
with the bay 20, data can be stored on the hard disk drive by the
user of the computer 14. Then, the sleeve 12 with hard disk drive
can be ejected from the computer 14 and transported to another
location for data retrieval.
In cross-reference to FIGS. 1 and 2, the sleeve 12 is made of an
upper plastic injection-molded half 12a and a lower plastic
injection-molded half 12b, and the upper half 12a is bonded, glued,
or otherwise attached to the lower half 12b by means well-known in
the art to establish a hollow sleeve 12. As can be appreciated in
reference to FIG. 2, the sleeve 12 closely surrounds a portable
hard disk drive 25 for supporting the disk drive 25. Preferably,
the sleeve 12 is made of nylon or other plastic material to protect
the disk drive 25 from shock, and to inhibit dust and debris from
contacting the disk drive 25. In the presently preferred
embodiment, the hard disk drive 25 is a model 2022A hard disk drive
made by Digital Electronics Corporation. Alternatively, the disk
drive 25 can be drive made by Toshiba Corp., or Hitachi Corp., or
some other disk drive manufacturer.
As shown in cross-reference to FIGS. 1 and 2, a right guide channel
26 is longitudinally formed in a right side surface 28 of the lower
half 12b of the sleeve 12. FIG. 2 further shows that a left guide
channel 30 is longitudinally formed in a left side surface 32 of
the lower half 12b of the sleeve 12.
Referring back to FIG. 1, the sleeve 12 defines a top surface 33
and a bottom surface 35, and the guide channels 26, 30 are formed
closer to the top surface 33 than to the bottom surface 35. As more
fully disclosed below, the guide channels 26, 30 slidably engage
structure within the bay 20. With this in mind, it will be
appreciated that inverted insertion of the sleeve 12 into the bay
20 is prevented by so forming the guide channels 26, 30 closer to
one surface 33 than to the opposite surface 35. The sleeve 12 also
has a bottom front edge 37 which is bevelled as shown to facilitate
insertion of the sleeve 12 into the bay 20.
Referring again to FIG. 2, right and left generally
parallelepiped-shaped latch depressions 34, 36 are also formed in
the bottom surface 35 of the lower half 12b of the sleeve 12. As
intended by the present invention, the latch-depressions 34, 36
establish corresponding engagement surfaces.
As shown in FIG. 2, an electrical sleeve connector, generally
designated 38, is positioned on a connector surface 40 of the
sleeve 12. More particularly, the sleeve connector 38 includes a
flat, generally parallelepiped-shaped bay interface connector 42
having a plurality of pins 42a and a corresponding plurality of
sockets 42b.
Also, the sleeve connector 38 includes a flat,
parallelepiped-shaped intermediate printed circuit board (pcb) 44
having a plurality of first sockets 44a and a plurality of second
sockets 44b. As can be appreciated in reference to FIG. 2, the pins
42a of the bay interface connector 42 engage the first sockets 44a
of the interface pcb 44.
Additionally, the sleeve connector 38 includes a flat,
parallelepiped-shaped disk drive interface connector 46 having a
plurality of L-shaped pins 46a, and the L-shaped pins 46a engage
the second sockets 44b of the intermediate disk drive interface pcb
44. Moreover, the disk drive interface connector 46 includes a
plurality of sockets (not shown) which engage hard drive connector
pins 25a of the hard drive 25.
It will accordingly be appreciated that the memory media of the
hard drive 25 is in electrical communication with the sleeve
connector 38. Consequently, the sockets 42b of the bay interface
connector 42 of the sleeve connector 38 can be electrically engaged
with structure within the bay 20, as more fully disclosed below, to
establish electrical communication between the memory media of the
hard drive 25 and the PC 14.
In the presently preferred embodiment, the sleeve connector 38 is
similar to the so-called PCMIA connector well-known in the art,
except that the connector 40 includes sixty (60) connections
instead of sixty eight (68). As intended by the present invention,
to provide for interoperability of the present invention with both
SCSI-type and IDE-type hard drives, power can be applied or not
applied via various pin connections as appropriate for the
particular disk drive 25 type, by conventions well-known in the
art. Also, one of the connections of the sleeve connector 38,
designated the "identification" connection, is shorted. As the
skilled artisan will appreciate, the identification connection can
be used to determine whether the hard drive 25 is an IDE- or
SCSI-type hard drive. In addition, six lines may be reserved for
providing a data path for signals that identify the particular disk
drive 25 model.
FIG. 2 also shows that the bay interface connector 42 is formed
with two opposed ears 48a, 48b. Also, the lower half 12b of the
sleeve 12 is formed during molding with clips 50a, 50b that
respectively engage the ears 48a, 48b of the bay interface
connector 42. Also, the clips 50a, 50b support the bay interface
connector 42. In the presently preferred embodiment, the clips 50a,
50b snappingly engage the ears 48a, 48b to hold the ears 48a, 48b
against the clips 50a, 50b.
Now referring to FIGS. 1 and 3A-3C, the details of the bay 20 can
be seen. As shown in FIG. 1, the bay 20 includes a hollow,
generally parallelepiped-shaped metal or hard plastic molded
chassis 52. The chassis 52 has a bottom plate 54, and first and
second side surfaces 56, 58 extending upwardly from the bottom
plate 54 perpendicular to the bottom plate 54. As shown, each side
surface 56, 58 of the chassis 52 has holes 57 drilled or otherwise
formed in it, for receiving respective threaded fasteners (not
shown). The fasteners in turn are engaged with standard mounting
receptacles (not shown) within the computer 14, to hold the chassis
52 within the cavity 16 of the computer 14.
Accordingly, the chassis 52 is configured for fitting snugly within
the cavity 16 of the computer 14. Specifically, when the computer
14 is an IBM-compatible desk top PC and the cavity 16 is a
so-called "3.5 inch form factor" cavity, the chassis 52 has a
length "L" of about six inches (6"), a width "W" of about four
inches (4"), and a depth "D" of about one and five-eighths inches
(1.625").
FIGS. 1 and 3A also show that each side 56, 58 of the bay 20 is
respectively formed with two key elements 60, 62 and 61, 63 for
engaging the guide channels 26, 30 of the sleeve 12 and thereby
guiding the sleeve 12 with disk drive 25 into operable engagement
with the bay 20. As shown, the key elements 60, 61, 62, 63 are
substantially identical to each other in configuration, and each
key element 60, 61, 62, 63 protrudes inwardly toward the center of
the bay 20 from the key element's respective bay side 56, 58.
In describing the key elements 60, 61, 62, 63 the key element 60 is
used an example. As shown in FIG. 1, the key element 60 is formed
with a base portion 64 and a key surface 66. As further shown, to
minimize the material required for the key element 60, the base
portion 64 is not a continuous solid piece of material, but rather
includes two legs 68, 70, and the legs 68, 70 support the key
surface 66.
The key surface 66 includes a guide surface 72 which is oriented at
an oblique angle relative to the side 56 to guide the left guide
channel 30 (FIG. 2) of the sleeve 12 into engagement with the key
element 60. Stated differently, the guide surface 72 establishes a
ramp from near the first side 56 of the bay 20 up to the key
surface 66, to facilitate engaging the sleeve 12 with the key
element 60.
In cross-reference to FIGS. 1 and 3A, a motor-driven carriage,
generally designated 74, is disposed in the bay 20 for moving the
sleeve 12 with hard disk drive 25 within the bay 20. As shown, the
carriage 74 includes a hollow, generally parallelepiped-shaped
shuttle 76. The shuttle 76 is connected to or formed integrally
with left and right arms 78, 80, and each arm 78, 80 is pivotally
connected to a respective elongated left or right clip 82, 84.
More specifically, each arm 78, 80 is formed with a respective end
pin 86, 88 (FIG. 3A), and the end pins 86, 88 are rotatably engaged
with respective pin receiving holes formed in the clips 82, 84.
Consequently, the clips 82, 84 can pivot about their pin receiving
holes relative to the arms 78, 80. If desired, limiter abutments 90
(FIG. 3A) can be formed on the clips 82, 84 to thereby limit the
range of pivotal motion of the clips 82, 84 by abutting the arms
78, 80 when the clip 82 or 84 exceeds a predetermined angle
relative to its arm 78, 80. Still further, each arm 78, 80 is
formed with a respective extension 78a, 80a, with the only
difference between the arms 78, 80 being that the extension 78a of
the left arm 78 is marginally shorter than the extension 80a of the
right arm 80, for purposes to be disclosed.
In continued cross-reference to FIGS. 1 and 3A, each clip 82, 84 is
formed during molding with a respective sleeve stop 82a, 84a (stop
84a shown only in FIG. 3A), and a respective engagement abutment
82b, 84b (abutment 84a shown only in FIG. 3A) having a respective
front incline 82c, 84c. In accordance with the present invention,
the engagement abutments 82b, 84b are configured for engaging the
latch depressions 34, 36 (FIG. 2) of the sleeve 12. Further, the
skilled artisan will appreciate that the front inclines 82c, 84c
facilitate guiding the sleeve 12 past the inclines 82c, 84c and
toward the engagement abutments 82a, 84a.
As perhaps best shown in FIG. 3A, the present invention provides
structure for reciprocally moving the shuttle 76 (and, hence, clips
82, 84) within the bay 20. Specifically, an electric motor 92,
preferably a type FK-130SH-09450 motor made by Mibuchi, is coupled
to spur gears (not shown) which are disposed in a gear box 94. The
spur gears reduce the rotational speed of the shaft of the motor 92
about twenty times by means well-known in the art. If desired,
supports 95 can be attached to the bay 20 and juxtaposed with the
gear box 94 to restrain the gear box 94 from motion.
As can be appreciated in reference to FIG. 3A, the spur gears are
coupled to a lead screw 96, preferably a lead screw made by Acme
having a pitch of one millimeter (1 mm) and an outer diameter of
four millimeters (4 mm). As shown, the lead screw 96 extends into a
cavity 98 formed in the shuttle 76, and the cavity 98 has a
plurality of nut docks 98i to permit configuring the carriage 74 as
appropriate for different sized bays. A nut 100 is disposed in one
of the nut docks 98i of the cavity 98 of the shuttle 76 and is
threadably engaged with the lead screw 96.
It may now be appreciated that with the combination of structure
disclosed above, the motor 92 can be activated to move the carriage
74 within the bay 20. More particularly, the motor 92 can be
activated to cause the lead screw 96 to rotate, and as the lead
screw 96 rotates, the nut 100 rides on the lead screw 96 and thus
moves translationally within the bay 20. Consequently, the shuttle
76 and, hence, clips 82, 84 also move translationally within the
bay 20. As the skilled artisan will appreciate, by appropriately
establishing the direction of rotation of the motor 92, the
direction of translational motion of the carriage 74 within the bay
20 can be established.
FIGS. 1 and 3A show that two twin ramps 106 (FIGS. 1 and 3A), 108
(FIG. 3A only) are formed on the bottom plate 54 of the bay 20, and
the ramps 106, 108 are configured identical to each other. Taking
as an example the ramp 106 shown in FIG. 1, the ramp 106 is formed
with a first ramp surface 106a that extends upwardly from the
bottom plate 54 toward the rear of the bay 20 to a home camming
surface 106b, with the home camming surface 106b being parallel to
the bottom plate 54 of the bay 20. Also, the ramp 106 includes a
second ramp surface 106c that extends upwardly from home camming
surface 106b to an engaged camming surface 106d, with the engaged
camming surface 106d being parallel to the bottom plate 54 of the
bay 20.
FIGS. 1 and 3A show that the present invention incorporates four
limit switches. More particularly, FIGS. 1 and 3A show that a
lever-type insert limit switch 110 is attached to the bottom plate
54, for instance by heat-staking. As more fully disclosed below,
the sleeve 12 operates the insert limit switch 110. In response,
the limit switch 110 generates an electrical signal.
Additionally, FIG. 3A shows that a cherry-style engaged limit
switch 111 is heat-staked to the bay 20, for operation to be
disclosed shortly. Moreover, FIGS. 1 and 3A show that a lever-type
release limit switch 114 is attached to the bottom plate 54, for
instance by heat-staking. As more fully disclosed below, the
carriage 74 operates the release limit switch 114. Still further,
FIGS. 1 and 3A show that a lever-type home limit switch 118 is
attached to the bottom plate 54, for instance by heat-staking,
generally opposite the release limit switch 114. As more fully
disclosed below, the carriage 74 operates the home limit switch
118.
In the operation of the present invention, cross-reference is made
to FIGS. 1 and 3A-3C. FIG. 3A shows the carriage 74 in a home
position, wherein the engagement abutments 82b, 84b of the clips
82, 84 are positioned above the home ramp surface 106b, 108b,
respectively, of the ramps 106, 108. When the carriage 74 is in the
home position, and it is desired to engage the disk drive 25 with
the computer 14, the sleeve 12 (shown in phantom in FIGS. 3A-3C)
with disk drive 25 is advanced through the opening 22 of the bay 20
until the sleeve 12 abuts the engagement abutments 82b, 84b of the
clips 82, 84. Further slight urging of the sleeve 12 causes the
sleeve 12 to ride up the respective front inclines 82c, 84c of the
engagement abutments 82b, 84b until the engagement abutments 82b,
84b of the clips 82, 84 begin to engage the latch depressions 34,
36 (FIG. 2) of the sleeve 12.
When the sleeve 12 is in the home position shown in FIG. 3A, the
sleeve 12 abuts the insert limit switch 110 to cause the insert
limit switch 110 to generate an electrical signal. In response to
the signal from the insert limit switch 110, the motor 92 is
activated to rotate the lead screw 92 such that the carriage 74
with sleeve 12 moves rearwardly in the bay 20, i.e., toward the
motor 92, to an engaged position shown in FIG. 3B.
As the carriage moves rearwardly, the clips 82, 84 ride up the
second ramp surfaces 106c, 108c of the ramps 106, 108 and onto the
engaged camming surfaces 106d, 108d. The skilled artisan will
recognize that as the clips ride up the second ramp surfaces 106c,
108c, the engagement abutments 82b, 84b of the clips 82, 84 fully
engage the latch depressions 34, 36 (FIG. 2) of the sleeve 12.
When the carriage 74 with sleeve 12 reaches the engaged position
shown in FIG. 3B, the left clip 82 abuts the engaged limit switch
111, causing the switch 111 to generate and electrical signal. As
more fully disclosed below, the signal from the engaged limit
switch 111 causes the motor 92 to stop, and power is applied to the
hard drive 25. The sleeve 12 with disk drive 25 remains in the
engaged position shown in FIG. 3B, with the memory media of the
disk drive 25 in electrical communication with the computer 14.
As intended by the present invention, when the carriage 74 with
sleeve 12 is in the engaged position, the bay interface connector
42 of the sleeve 12 is operatively engaged with an electrical bay
connector 112 that is mounted on a daughter board 113 of the bay
20. As further intended by the present invention, the daughter
board 113 is in turn electrically connected to a back plane board
115 (FIG. 1) which holds the electrical components discussed more
fully below.
Also, the electrical bay connector 112 (FIGS. 3A-3C) is connected
to an external interface connector 112A (FIG. 1) which is also
mounted on the daughter board 113 on the side of the daughter board
113 which is opposite the bay connector 112. In turn, the external
interface connector 112A is connected via a ribbon connector cable
(not shown) to the main data bus, e.g., the SCSI or IDE bus, as
appropriate, of the computer 14.
When it is desired to remove the sleeve 12 with disk drive 25 from
the bay 20, the operator of the present invention depresses a
pushbutton 116 which is mounted on the front of the bay 20 (FIG.
1). The pushbutton 116 is associated with a Panasonic momentary
contact switch for generating an eject signal when the pushbutton
116 is depressed. An indicator LED 117 is mounted on the bay 20
adjacent the pushbutton 116 for purposes to be disclosed
shortly.
When the pushbutton 116 is depressed, it generates an eject signal.
Then, in one embodiment after the elapse of a predetermined time
period to permit the disk drive 25 to spin down, the motor 92
rotates the lead screw 96 to move the carriage 74 with sleeve 12
toward the remove position shown in FIG. 3C. In another embodiment,
no predetermined time period need elapse before the motor 92 is
activated.
As the carriage 74 moves toward the remove position shown in FIG.
3C, the clips 82, 84 ride down the ramps 106, 108, until the
engagement abutments 82b, 84b are respectively positioned over the
first ramp surface 106a, 108a of the respective ramp 106, 108. In
the remove position shown in FIG. 3C, two operations occur. The
first is that the engagement abutments 82b, 84b are distanced from
the latch depressions 34, 36 (FIG. 2) of the sleeve 12, thereby
causing the sleeve 12 to be released from the carriage 74.
The second operation that occurs when the carriage 74 is in the
remove position shown in FIG. 3C is that the extensions 78a, 80a of
the respective left and right arms 78, 80 respectively contact,
i.e., make, the remove limit switch 114 and home limit switch 118.
When these switches 114, 118 are made, they generate electrical
signals in response. The presence of electrical signals from both
of the switches 114, 118 causes the motor 92 to reverse direction,
thereby moving the carriage 74 back toward the home position shown
in FIG. 3A. The sleeve 12 with hard disk drive 25 can then be
manually removed from the bay 20.
As the carriage 74 starts to move back to the home position shown
in FIG. 3A, the extension 78a of the left arm 78 releases the
remove limit switch 114. Consequently, the remove limit switch 114
stops generating a signal. Owing to the marginally greater length
of the extension 80a of the right arm 80 vis-a-vis the opposite
extension 78a, however, the home limit switch 118 remains made,
and, in accordance with the present invention, the motor 92 remains
activated in the reverse direction when only the home limit switch
118 is made.
When the carriage 74 reaches the home position shown in FIG. 3A,
the extension 80a of the right arm 80 releases the home limit
switch 118. The absence of a signal from both the remove limit
switch 114 and home limit switch 118, causes the motor 92 to
deactivate.
FIG. 4 shows the electrical components 6f the present invention,
which, the presently preferred embodiment, can be physically
located on the back plane board 115 (FIG. 1), or some other
convenient location within the bay 20. As shown in FIG. 4, the
electrical bay connector 112 (located on the daughter board 113,
FIG. 1) is connected to a main data bus 120 of the computer 14. It
is to be understood that while the data bus 120 can be any suitable
bus, e.g., an IDE bus, in the embodiment shown in FIG. 4 it is a
SCSI bus.
In turn, access to the data bus 120 is controlled by a data bus
controller 122, physically located on the back plane board 115
(FIG. 1). The data bus controller 122 is any suitable bus control
device having the appropriate terminal resistors and routing leads.
The data bus controller 122 is also connected to a suitable
standard LED controller 124, and the LED controller 124 in turn
controls activation of the LED 117 by means well-known in the
art.
A motor controller 126 is connected to the data bus controller 122
for controlling activation of the motor 92. In the presently
preferred embodiment, the motor controller 126 is a system made of
various logic devices of the 74LS series which are coupled to
output amplifying transistors by means well-known in the art. As
shown in FIG. 4, the motor controller 126 receives the signals
generated by the limit switches 110, 111, 114, 118 for selectively
activating the motor 92.
FIG. 4 also shows that, if desired, the motor controller 126 can
access a timer 128. The timer 128 can be any suitable computer
timer. Further, a device identification switch 130 (FIGS. 1 and 4)
can be provided for establishing a physical identification number
for the device associated with the bay 20. For example, the switch
can be a well-known manually set octel switch.
FIG. 5 shows the logical steps of the present invention in ejecting
the hard drive 25 from the bay 20. As shown at block 132, the
pushbutton 116 is initially depressed to generate an eject signal.
The motor controller 126 receives the signal from the pushbutton
116 and, at decision block 133, determines whether the hard drive
25 is currently being accessed. If so, the motor controller 126
deactivates the hard drive 25 and, in one embodiment, waits a
predetermined time period at block 134 after receipt of the signal.
In another embodiment, the procedure at block 134 is not
executed.
Then, the controller 126 activates the motor 92 at block 136.
Otherwise, the motor controller 126 immediately activates the motor
92 at block 136 to eject the hard drive 25 from the bay 20. It is
to be understood that the motor controller 126 can access the timer
128 at block 134. Thus, block 134 functions as a software
timer.
The skilled artisan will appreciate that by waiting a predetermined
time period before ejecting the drive 25 when the drive 25 is in
use, the motor controller 126 ensures that the hard drive 25 has
properly "spun down" before ejection. Thereby, damage to the hard
drive 25, which could otherwise occur if the sleeve 12 with drive
25 were ejected while the hard drive 25 was still rotating, is
avoided.
Thus, at block 136, the motor controller 126 activates the motor 92
to move the sleeve 12 with hard drive 25 toward the home position.
When the sleeve 12 reaches the home position shown in FIG. 3A, the
flag 102 abuts the home limit switch 118 to cause the limit switch
to generate an electrical signal, and at block 138 the motor
controller 126 receives the signal. In response, the motor
controller 126 moves to block 140 and deactivates the motor 92. The
sleeve 12 with hard drive 25 can then be manually removed from the
bay 20.
During the steps described above, the LED controller 124 controls
activation of the LED 117 (FIG. 1 ) as follows. When the bay 20 is
empty, the LED 117 is constantly green. When the sleeve 12 with
hard drive 25 is disposed in the bay 20 and operably engaged with
the computer 14, the LED 117 is constantly amber. When the eject
button 116 has been depressed, during the wait period of block 134
of FIG. 5 described above, the LED 117 alternately flashes amber,
then green. When the hard drive 25 has experienced an error, the
LED 117 is constantly red.
While the particular bay for portable hard disk drive as herein
shown and described in detail is fully capable of achieving the
above-stated objects, it is to be understood that it is merely
exemplary, and that the present invention fully contemplates other
particular embodiments, and that the scope of the present invention
is to be limited by nothing other than the appended claims.
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